Miscellaneous options

FATheme has a few other properties that may be of use to you.

Automatically use Segoe font (Windows only)

Use the UseSystemFontOnWindows property to ensure the Segoe UI (Windows 10) or Segoe UI Variable (Windows 11) are used automatically with the Fluentv2 styles. If true (default), this will set the resource ContentControlThemeFontFamily to the appropriate font. As these fonts are Windows only, this property has no effect on other platforms.

Control text vertical alignment

FluentAvalonia is based on Microsoft’s Fluent design system which requires the Segoe UI font family. On non-Windows platforms where these fonts aren’t available, some mis-alignments may occur as certain controls use margins or alignments specifically designed for these fonts (see PR #210 for more). The TextVerticalAlignmentOverrideBehavior property adds options to help correct this. The TextVerticalAlignmentOverride enum has 3 values:

• Disabled
  • Don’t use any corrections (use the styles as-is)
• EnabledNonWindows (default)
  • Only use the corrections if not on Windows
• AlwaysEnabled
  • Always use the corrections (even on Windows)

This property is only respected upon startup.